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n coins and you want to build a staircase with these coins. The staircase consists of
k rows where the
ith row has exactly
i coins. The last row of the staircase may be incomplete.
Given the integer
n, return the number of complete rows of the staircase you will build.
Input: n = 5 Output: 2 Explanation: Because the 3rd row is incomplete, we return 2.
Input: n = 8 Output: 3 Explanation: Because the 4th row is incomplete, we return 3.
1 <= n <= 231 - 1